1. Introduction

In Java, we can check if one string is a rotated version of another by comparing the lengths of the two strings and checking whether one string is a substring of another string concatenated with itself. In this tutorial, we will learn how to check whether one string is a rotated version of another string in Java.

2. Program Steps

1. Define a main method to serve as the entry point of the program.

2. Define two strings: one that needs to be checked as a rotated version of the other.

3. Check if the length of the two strings is the same, and the concatenated original string contains the string to be checked as a substring.

4. Print the result.

3. Code Program

public class CheckRotatedString {

    public static void main(String[] args) {
        // Step 2: Define two strings
        String str1 = "ABCD";
        String str2 = "CDAB";

        // Step 3: Check if str2 is a rotated version of str1
        if (str1.length() == str2.length() && (str1 + str1).contains(str2)) {
            // Step 4: Print the result
            System.out.println(str2 + " is a rotated version of " + str1);
        } else {
            System.out.println(str2 + " is not a rotated version of " + str1);
        }
    }
}

Output:

CDAB is a rotated version of ABCD

4. Step By Step Explanation

– Step 1: The main method is defined, acting as the entry point of the program.

– Step 2: Two strings str1 and str2 are defined. We want to check if str2 is a rotated version of str1.

– Step 3: We compare the lengths of str1 and str2. Then we concatenate str1 with itself and check if it contains str2 as a substring.

– Step 4: Based on the result of the check in Step 3, we print whether str2 is a rotated version of str1 or not.

Thus, the program correctly identifies whether one string is a rotated version of another string and prints the result.